I would support the ‘Be Realistic’ option. I remember visiting Cairo last year and noticing for the first time that the usual smog that has always hovered over the city was not as bad as usual. When I asked a local taxi driver about it, he told me that he and most other taxi drivers were using natural gas instead of gasoline to fuel their vehicles. He said that the cost of converting to natural gas was about 5,000 Egyptian pounds, (roughly $700) but that their financial savings from using natural gas paid for the conversion in a short time. After that they were able to take home more money than when they had used gasoline and of course they helped the environment.
Of course, Egypt has plenty of natural gas and they have set up many natural gas stations throughout the capital city. This was a win-win situation: the taxi drivers were happy and the air had cleared up. This might not work in another country where natural gas is not available or cheap, but it has worked in Egypt. There are times when conservation has to be mandated, but for the most successful environmental options, a practical win-win situation is always better and longer-lasting.